We recently moved from the big city to the country, and into a 45 yr. old house. We discovered under 2 layers of carpet this sad old hardwood floor. The bottom layer was glued down and stapled to boot. Is there any disolvant that can be used on the remainer of glue that is left after scraping. Also the staples holes add some character to the floor but there are some big spaces between some of the planks, what do I fill the gaps with?